[whitelightening]

I have a 97 F-150. Stange thing is happening with my trailer lights. When plugged into our camper with the full hookup of trailer brakes, lights, etc., the lights on my camper work fine.

When hooked up to a simple jet ski trailer only the tail lights work. The Jet ski trailer lights are confirmed okay. I used a test meter and the problem is in the truck. I have seen several postings that relate to this same type of problem. All say to check fuses which I have. Anyone have any other ideas. Could it be one of the relays? Or maybe some sort of grounding problem since the lights work when connected to the camper.

Thanks,

WL